Hi
Thought I'd share this.
I run LMS on a Pcengines APU with 4G RAM.
OverlayRoot is active.
OS is on a standard SSD,
Music is on a separate (writeable) ZFS volume.
Problem
I constantly run out of memory since the newer releases.
So I had to add SWAP. And I wanted it on the ZFS storage, but keep the
overlayroot.
This is how I did.
This is Ubuntu 18 LTS.
Feel free to improve.
Regards
M
Code:
--------------------
# SWAP ON ZFS, but INSIDE OVERLAYROOT
# Do this with overlayroot off, because easier:
# ZFS no worky in overlayroot-chroot, and
# Ersatz-rc-local.service needs to be saved permanently
# or just patch yourself through... half/half
# Reason for this mess
# - ZFS needs a special swapfile treatment
# - fstab entry wont work (in my case), we daisychain a /sbin/swapon via
systemd from inside the overlay.
# zfs tank variable
TANK=bulker
# creating a non-COW dataset for swap
#
https://askubuntu.com/questions/1198903/can-not-use-swap-file-on-zfs-files-with-holes
zfs create -V 8G -b $(getconf PAGESIZE) -o logbias=throughput -o sync=always
-o primarycache=metadata -o com.sun:auto-snapshot=false $TANK/swap
mkswap -f /dev/zvol/$TANK/swap
# just for test, should reveal SWAP in 'free -m'
/sbin/swapon /dev/zvol/$TANK/swap
# Dont begin with fstab
# instead we do rc.local necromancy
# https://wiki.ubuntuusers.de/rc.local/
cat > /etc/systemd/system/Ersatz-rc-local.service<<GUSTAF
[Unit]
After = network-online.target
Wants = network-online.target
[Service]
Type = oneshot
RemainAfterExit = yes
ExecStart = /sbin/swapon /dev/zvol/$TANK/swap
[Install]
WantedBy = multi-user.target
GUSTAF
systemctl enable Ersatz-rc-local.service
exit
# and enable your overlayroot again
# my /etc/overlayroot.conf says:
overlayroot_cfgdisk="disabled"
overlayroot=""
overlayroot="tmpfs:swap=0,recurse=0"
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